Rolling tube



March 15, 1932. R. BucHwALD ROLLING TUBE 2 Sheets-Sheet 1 Filed June 22, 1929 INVENT-OR MW W March 15, 1932. R. BucHwALD l,849,973

aoLmuG 'was Filed June 22, 1929 2 Sheets-Sheet 2 lv v L l INVENTOR MW WM-d Jwmav Patented Mar. 15, 1932 APATENT oFFicE manual) necu-wam. or Braemar-earn, ennmm nontnte mm Application fle June 22, 1989, Serial Bo.

The purpose of the present invention is to provide a simple and practical device h means of which simultaneously with the rol ing of a tube and in the same heat the finishing and sizing operation can be carried out.

For the rolling operation use is made of a pilgering mill. Y

The finishing and sizing rolling mills for Vpilger-rolled tubes used up to the present time are rolling mills with special power drive arranged separately from the pilgerway, that is to say plants which will involve high initial cost and expensive operation as u well as a repeated heating of the tube, irredirectly spective of the large amount of space reuired for the erection of such plants.

urther v`and important disadvantage with known finishing and sizing rolling mills is to be seen in the fact that the pilger humps are forced inwards.

I, The present invention consists in that the finishing and sizing rolls actuated by means of rolls are arranged on the pilger housing or in the rear thereof in such a manner, that they will act in longitudinal direction on the mandrel, producing at the same time and in the same heat a tube during the step-wise pilger-method, which will possess smooth interior and exterior surfaces.

A mode of execution according to the present invention is shown hy way of examp e in the drawings in which Figure 1 is a diagrammatic side elevation of the', device for carrying' out the rolling process according to this invention;

Figure 2 is a rear view.

Figures 3 and 4 show in vertical section and in plan a device according to the invention, in vhich the individual parts can be made out, an

Figure shows a modification of the arrangement according to Figure 1.

In all the Figures a denotes the pilgering rolls operatin m'well known manner and are the finishin or sizin rolls respectively which are free y rotatake and which Will operate as so-called idle rollers, that is to say they are not driven. a represents the pilgered tube located upon a pilgeriug man- 878940, :mi in Germany me 2B, 1028.

drel The sizing and finishing rolls form a eircular closed pass. The rolls are jour-` nalled in the ilger housing proper or in the rear thereof, ut at any rate rather close, so that the finishing and sizing operation takes 54 place simultaneously and in the same heat as the vpilgering process. Said finishing and sizing operation is carried through in such a manner that the rolls will still operate or roll on the mandrel but the said operation may also be carried out outside of the latter.

In the modification according to Figures 1 and 2 two finishing or sizing rolls b are provided, but there may also be employed more than two rolls, as is illustrated in Figure 5.

In that instance one pair of rolls maybe A used for sizing and the other pair for the finishing operation.

Since a pilgering mill is employed the sizing or finishing rolls must be opened out during the known turning of the tube, that is to say, they must be distanced somewhat.

For that purpose an arrangement may be employed, such as is represented in Figures 3 and 4.

U on the axle end of the upper roll a a crani f is mounted, which Will reci rocate the lever h and the shaft by means o a linking rod g. A lever 'k mounted on the said shaft i will transmit this motion by means of a rod to the levers m and cams n, Secured to shafts o jom-nalled in the frame or housing. The finishing rolls b are supported in swinging levers p, which in their turn are again mounted on shafts r.

During the movement of the shaft i the cams n .will bear upon rollers g arranged in the swin 'ng lever p (see Figure 3) and lift the rolls`` from the tube treated.

The material advantage of the arrangement according to the present invention consists in that in contradistinction to known arrangements used up to the present high initial `costs as well as the re-heating furnace Will be dispensed with. Thus there will be u a considerable saving in money time and s ace and besides a superior product will be o tained.

I claim:

1. The improvement in the art of rolling tubes which comprises passing a hollow billet upon a mandrel bar between pilgering rolls and then between freely rotatable finishing and sizing rollers With a circular closed pass arranged near the pilgering rolls in such a manner, that the finishing and sizing rollers roll over the pilgering mandrel.

2. The improvement in the art of rolling tubes which comprises passing a hollow bil let upon a mandrel bar between pilgering rolls and then between freely rotatable finishin and sizing rollers with a circular close pass arranged near the pilgering rolls in such a manner, that the finishing and sizing rollers roll over the pilgering mandrel, turning the tube and holding said finishing anl sizing rollers during the turning of the tu e.

3. The improvements in the art of rolling tubes Which comprises passing a hollow billet upon a mandrel bar between pilgering rolls and then between fneely rotatable finishing and sizing rollers With a circular closed pass arranged near the pilgering rolls in such a manner, that the finishing and sizing rollers roll over the pilgering mandrel, turning the tube and opening said finishing and sizing rollers by cam means for the turnin of the tube.

n testimony Whereof I have signed my name to this specification.

REINHARD BUCHWALD.

CERTIFICATE OF GORRECTION.

Patent No. 1,849,973. Granted March 15, 1932, to

REINHARD BUGHWALD.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as lollows: Page 2, line 17, claim 2, alter the word "rollers" insert the word open; and that the said Letters Patent should be read with this correction therein that the same may confonn to the record of the case in the Patent Office.

Signed and sealed this 17th day of May, A. 1932.

M. J. Moore,

(Seal) Acting Commisaioner of Patents.

tubes which comprises passing a hollow billet upon a mandrel bar between pilgering rolls and then between freely rotatable finishing and sizing rollers With a circular closed pass arranged near the pilgering rolls in such a manner, that the finishing and sizing rollers roll over the pilgering mandrel.

2. The improvement in the art of rolling tubes which comprises passing a hollow bil let upon a mandrel bar between pilgering rolls and then between freely rotatable finishin and sizing rollers with a circular close pass arranged near the pilgering rolls in such a manner, that the finishing and sizing rollers roll over the pilgering mandrel, turning the tube and holding said finishing anl sizing rollers during the turning of the tu e.

3. The improvements in the art of rolling tubes Which comprises passing a hollow billet upon a mandrel bar between pilgering rolls and then between fneely rotatable finishing and sizing rollers With a circular closed pass arranged near the pilgering rolls in such a manner, that the finishing and sizing rollers roll over the pilgering mandrel, turning the tube and opening said finishing and sizing rollers by cam means for the turnin of the tube.

n testimony Whereof I have signed my name to this specification.

REINHARD BUCHWALD.

CERTIFICATE OF GORRECTION.

Patent No. 1,849,973. Granted March 15, 1932, to

REINHARD BUGHWALD.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as lollows: Page 2, line 17, claim 2, alter the word "rollers" insert the word open; and that the said Letters Patent should be read with this correction therein that the same may confonn to the record of the case in the Patent Office.

Signed and sealed this 17th day of May, A. 1932.

M. J. Moore,

(Seal) Acting Commisaioner of Patents. 

